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Silver Bow Creek/Butte Area Superfund Site

Submissions from 2026 2026

Butte Priority Soils Operable Unit (BPSOU) 2025 Monthly Progress Report. Consent Decree for the Butte Priority Soils Operable Unit. Civil Action No. CV 89-039-BU-SEH, Atlantic Richfield Company

Final Repository Siting Study (RSS) Detailed Evaluation and Recommendations Report, Atlantic Richfield Company and Butte Silver Bow

2020 through 2024 Groundwater Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

2020 through 2024 Groundwater Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

2020 through 2024 Groundwater Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

2020 through 2024 Groundwater Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

2020 through 2024 Groundwater Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

2020 through 2024 Surface Water Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

2020 through 2024 Surface Water Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

2020 through 2024 Surface Water Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

2020 through 2024 Surface Water Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

2020 through 2024 Surface Water Compliance Evaluation Technical Memorandums Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE, Josh Bryson

Butte Priority Soils Operable Unit (BPSOU) 2026 Monthly Progress Report. Consent Decree for the Butte Priority Soils Operable Unit. Civil Action No. CV 89-039-BU-SEH, Josh Bryson

Butte Priority Soils Operable Unit (BPSOU) 2026 Monthly Progress Report. Consent Decree for the Butte Priority Soils Operable Unit. Civil Action No. CV 89-039-BU-SEH, Josh Bryson

Butte Priority Soils Operable Unit Diggings East Final 95% Remedial Design Package Submittal, Josh Bryson

MONTHLY PROGRESS REPORT BUTTE PRIORITY SOILS OPERABLE UNIT CONSENT DECREE PARTIAL REMEDIAL DESIGN/REMEDIAL ACTION AND OPERATION AND MAINTENANCE, Josh Bryson

MONTHLY PROGRESS REPORT BUTTE PRIORITY SOILS OPERABLE UNIT CONSENT DECREE PARTIAL REMEDIAL DESIGN/REMEDIAL ACTION AND OPERATION AND MAINTENANCE January 2026, Josh Bryson

Response to Agency Comments Re: Comment Letter for the 2022 Butte Priority Soils Operable Unit (BPSOU) Groundwater Compliance Evaluation (dated March 10, 2025), Josh Bryson

Response to Agency Comments Re: Comment Letter for the 2023 Butte Priority Soils Operable Unit (BPSOU) Groundwater Compliance Evaluation (dated March 10, 2025) Received May 7, 2025, Josh Bryson

Response to Agency Comments Re: Comments on the Draft Butte Priority Soils Operable Unit (BPSOU) 2020 Groundwater Compliance and Interpretation Technical Memorandum (dated May 12, 2022, Josh Bryson

Response to Agency Comments Re: Comments on the Draft Butte Priority Soils Operable Unit (BPSOU) Draft Surface Water Compliance and Interpretation Technical Memorandum (dated May 12, 2022), Josh Bryson

Silver Bow Creek Conservation Area (SBCCA) – Revised 95% Programmatic Technical Specifications Submittal, Josh Bryson

2022 BPSOU Stormwater Evaluation and Maintenance Report Annual Stormwater Report for BPSOU Stormwater Structures, Butte-Silver Bow Department of Reclamation and Environmental Services

2022 BPSOU Stormwater Evaluation and Maintenance Report Annual Stormwater Report for BPSOU Stormwater Structures, Butte-Silver Bow Department of Reclamation and Environmental Services

2022 BPSOU Stormwater Evaluation and Maintenance Report Annual Stormwater Report for BPSOU Stormwater Structures, Butte-Silver Bow Department of Reclamation and Environmental Services

2023 BPSOU Stormwater Evaluation and Maintenance Report Annual Stormwater Report for BPSOU Stormwater Structures, Butte-Silver Bow Department of Reclamation and Environmental Services

2023 BPSOU Stormwater Evaluation and Maintenance Report Annual Stormwater Report for BPSOU Stormwater Structures, Butte-Silver Bow Department of Reclamation and Environmental Services

2023 BPSOU Stormwater Evaluation and Maintenance Report Annual Stormwater Report for BPSOU Stormwater Structures, Butte-Silver Bow Department of Reclamation and Environmental Services

2024 Annual Operations and Maintenance Report - 2024 BRES Annual Summary Report for Work Completed in Quadrant 4, Butte-Silver Bow Department of Reclamation and Environmental Services

2024 Annual Operations and Maintenance Report 2024 BRES Annual Summary Report for Work Completed in Quadrant 4, Butte-Silver Bow Department of Reclamation and Environmental Services

2024 Annual Operations and Maintenance Report 2024 BRES Annual Summary Report for Work Completed in Quadrant 4, Butte-Silver Bow Department of Reclamation and Environmental Services

2024 BPSOU Stormwater Evaluation and Maintenance Report Annual Stormwater Report for BPSOU Stormwater Structures, Butte-Silver Bow Department of Reclamation and Environmental Services

2024 BPSOU Stormwater Evaluation and Maintenance Report Annual Stormwater Report for BPSOU Stormwater Structures, Butte-Silver Bow Department of Reclamation and Environmental Services

2024 BPSOU Stormwater Evaluation and Maintenance Report Annual Stormwater Report for BPSOU Stormwater Structures, Butte-Silver Bow Department of Reclamation and Environmental Services

DRAFT FINAL PHASE I PRE-DESIGN INVESTIGATION EVALUATION REPORT BLACKTAIL CREEK RIPARIAN ACTIONS BUTTE PRIORITY SOILS OPERABLE UNIT OF THE SILVER BOW CREEK/BUTTE AREA SUPERFUND SITE SILVER BOW COUNTY, MONTANA, HydroGeoLogic, Inc.

DRAFT FINAL REMEDIAL DESIGN WORK PLAN BLACKTAIL CREEK RIPARIAN ACTIONS BUTTE PRIORITY SOILS OPERABLE UNIT OF THE SILVER BOW CREEK/BUTTE AREA SUPERFUND SITE SILVER BOW COUNTY, MONTANA, HydroGeoLogic, Inc.

DRAFT INTERMEDIATE (60%) REMEDIAL DESIGN REPORT BLACKTAIL CREEK RIPARIAN ACTIONS BUTTE PRIORITY SOILS OPERABLE UNIT OF THE SILVER BOW CREEK/BUTTE AREA SUPERFUND SITE SILVER BOW COUNTY, MONTANA, HydroGeoLogic, Inc.

DRAFT UNIFORM FEDERAL POLICYQUALITY ASSURANCE PROJECT PLAN ADDENDUM, HydroGeoLogic, Inc.

Butte Priority Soils Operable Unit (BPSOU) Data Summary Report (DSR) Statement of Authenticity Updates, Mike McAnulty

Butte Priority Soils Operable Unit (BPSOU) Final Unreclaimed Sites Field Sampling Plan (FSP) Package #7: UR-01, UR-12, UR-03, UR-04, UR-15, and UR-17 Amendment, Mike McAnulty

Butte Priority Soils Operable Unit Final Butte Hill Revegetation Specifications, Mike McAnulty

Butte Medical Monitoring Working Group Meeting, Mike McAnulty and Eric Hassler

Butte Medical Monitoring Working Group Meeting, Mike McAnulty and Eric Hassler

Draft 2025 Butte Priority Soils Operable Unit Residential Metals Abatement Program Construction Completion Report, Abby Peltomaa

2026 Revised Draft Final BPSOU Backfill and Cover Material Quality Assurance Project Plan (QAPP), Pioneer Technical Services, Inc.

Draft Final 2024 Reclamation Improvement Sampling: BRES No. 78 – Original Mine Yard Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Draft Final Annual Operations and Maintenance (O&M) Report: Butte Treatment Lagoon (BTL) System – 2025, Pioneer Technical Services, Inc.

Draft Final Butte Mine Waste Repository Operation and Maintenance (O&M) Plan, Pioneer Technical Services, Inc.

Draft Final Butte Priority Soils Operable Unit (BPSOU) Insufficiently Reclaimed Sites BRES No. 30 – Atlantic 1 Remedial Action Work Plan (RAWP), Pioneer Technical Services, Inc.

Draft Final Butte Priority Soils Operable Unit (BPSOU) Insufficiently Reclaimed Sites Sister Dump (BRES No. 38) Remedial Action Work Plan (RAWP), Pioneer Technical Services, Inc.

Draft Final Butte Priority Soils Operable Unit Unreclaimed Sites: UR-03 Construction Completion Report, Pioneer Technical Services, Inc.

Draft Final Butte Priority Soils Operable Unit Unreclaimed Sites: UR-03 Construction Completion Report, Pioneer Technical Services, Inc.

Draft Final Quarterly Operations and Maintenance Report: Butte Treatment Lagoon System – Fourth Quarter 2025, Pioneer Technical Services, Inc.

Draft Final Silver Bow Creek Conservation Area Materials Management Plan Revision 1, Pioneer Technical Services, Inc.

Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 30 – Atlantic-1 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 32 – Corra 2 Dump Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 37 – Josephine Shaft Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 38 – Sister Dump Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 96 – Washoe Dump Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Unreclaimed Sites Sampling: UR-06 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Unreclaimed Sites Sampling: UR-12 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Unreclaimed Sites Sampling: UR-13 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Unreclaimed Sites Sampling: UR-20 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Unreclaimed Sites Sampling: UR-22 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Unreclaimed Sites Sampling: UR-28 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final 2022 Unreclaimed Sites Sampling: UR-28 Site Evaluation Summary ReportFinal 2022 Unreclaimed Sites Sampling: UR-28 Site Evaluation Summary Report, Pioneer Technical Services, Inc.

Final Annual Operations and Maintenance (O&M) Report: Butte Treatment Lagoon (BTL) System – 2023, Pioneer Technical Services, Inc.

Final Butte Priority Soils Operable Unit (BPSOU) Unreclaimed Sites: UR-08 (Anderson Shaft) Remedial Action Work Plan (RAWP), Pioneer Technical Services, Inc.

Final Insufficiently Reclaimed Sites Quality Assurance Project Plan (QAPP), Pioneer Technical Services, Inc.

Final Quarterly Operations and Maintenance Report Butte Treatment Lagoon System – First Quarter 2025, Pioneer Technical Services, Inc.

Final Quarterly Operations and Maintenance Report: Butte Treatment Lagoon System – Third Quarter 2025, Pioneer Technical Services, Inc.

Final Silver Bow Creek Conservation Area (SBCCA) Construction Quality Assurance Plan (CQAP), Pioneer Technical Services, Inc.

Final Unreclaimed Sites Quality Assurance Project Plan (QAPP), Pioneer Technical Services, Inc.

Revised Draft Final Butte Priority Soils Operable Unit (BPSOU) Insufficiently Reclaimed Sites Josephine Shaft (BRES No. 37) Remedial Action Work Plan (RAWP), Pioneer Technical Services, Inc.

Revised Draft Final Butte Priority Soils Operable Unit (BPSOU) Unreclaimed (UR) Sites New and Mahoney (UR-23) Construction Completion Report (CCR), Pioneer Technical Services, Inc.

Revised Draft Final Butte Priority Soils Operable Unit (BPSOU) Unreclaimed (UR) Sites New and Mahoney (UR-23) Construction Completion Report (CCR), Pioneer Technical Services, Inc.

Revised Draft Final Quarterly Operations and Maintenance Report: Butte Treatment Lagoon System – Second Quarter 2025, Pioneer Technical Services, Inc.

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) 2022 Draft Final Insufficiently Reclaimed Sites Sampling: BRES No. 16 Site Evaluation Summary Report, Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Rock Creek Cattle Company Borrow Submittal #2 (dated February 4, 2026), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Whitehall Borrow Submittal #3 (dated March 27, 2026), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Final Unreclaimed Sites Field Sampling Plan (FSP) Package #7: UR-01, UR-12, UR-03, UR-04, UR-15, and UR-17 Amendment (dated April 28, 2026), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-06 Site Evaluation Summary Report (dated December 10, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-12 Site Evaluation Summary Report (dated December 9, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-22 Site Evaluation Summary Report (dated December 10, 2025), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final Insufficiently Reclaimed Sites Joesphine Shaft (BRES No. 37) – Remedial Action Work Plan (RAWP) (dated March 24, 2026), Molly Roby

Re: Approval letter for the Butte Priority Soils Operable Unit - Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 96 – Washoe Dump Site Evaluation Summary Report, Molly Roby

Re: Approval letter for the Draft Final 2026 Butte Priority Soils Operable Unit (BPSOU) McDermott Basin Creek Water Treatment Plant Subsurface Fill Borrow Submittal #1, Molly Roby

Re: Comment letter for the Butte Priority Soils Operable Unit (BPSOU) 2026 Revised Draft Final Backfill and Cover Soil Quality Assurance Project Plan (QAPP) (dated January 5, 2026), Molly Roby

Re: Comment letter for the Draft Final Butte Priority Soils Operable Unit (BPSOU) Insufficiently Reclaimed Sites BRES No. 30 – Atlantic 1 Remedial Action Work Plan (RAWP) (dated March 24, 2026), Molly Roby

Re: Conditional Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Potential Logan, Montana, Borrow Source Site Environmental Assessment Checklist, Molly Roby

Re: Conditional Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Butte Hill Revegetation Specifications (dated August 15, 2025), Molly Roby

Re: Conditional Approval letter for the Butte Priority Soils Operable Unit Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 50 – Zelia Site Evaluation Summary Report, Molly Roby

Re: Conditional approval letter with comments for the Draft Final 2026 Residential Metals Abatement Program (RMAP) Anselmo Mine Yard Development Plan (dated February 25, 2026), Molly Roby

Re: Approval letter for the 2022 Butte Priority Soils Operable Unit (BPSOU) Stormwater Evaluation and Maintenance Report (dated April 8, 2026), Emma Rott

Re: Approval letter for the 2023 Butte Priority Soils Operable Unit (BPSOU) Stormwater Evaluation and Maintenance Report (dated April 8, 2026), Emma Rott

Re: Approval letter for the 2024 Butte Priority Soils Operable Unit (BPSOU) Stormwater Evaluation and Maintenance Report (dated April 8, 2026), Emma Rott

Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final Quarterly Operation and Maintenance Report: Butte Treatment Lagoons (BTL) System– Fourth Quarter 2025 (dated March 30, 2026), Emma Rott

Re: Approval letter for the Butte Priority Soils Operably Unit (BPSOU) Revised Draft Final Quarterly Operations and Maintenance Report: Butte Treatment Lagoon System (BTL) Second Quarter 2025 (dated April 10, 2026), Emma Rott

Re: Approval letter for the Final Repository Siting Study (RSS) Detailed Evaluation and Recommendations Report (dated February 11, 2026), Emma Rott

Re: Comment Letter for Butte Priority Soils Operable Unit Draft Leak Detection Monitoring Plan (dated February 2026), Emma Rott